Special (professional) detectors can ensure much earlier fire detection with minimal number of false alarms.

The system for the detection of smoke on the basis of a video image

The video image may also be used for the detection of smoke by using special algorithms. In large and spacious areas such detection method can be much more efficient in comparison with standard smoke detector systems. This is the only way for detecting smoke in outdoor areas, but with such use occasional false alarms are possible due to natural influences.
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Aspirating detectors are designed for very early detection of fire in “clean” areas where they are up to 100-times more sensitive than pin-point smoke detectors, as well as in areas with constant presence of dust and other dirt particles in the air where pin-point smoke detectors would consistently trigger false alarms. The detector consists of a very powerful laser measuring chamber which can distinguish (on the basis of a powerful processor and special algorithms) between smoke and other disturbing particles, and continuously coordinate its operation with regard to the ambient conditions. The suction part of the detector ensures a constant flow of air samples from the monitored environment into the measuring chamber. The fan integrated in the detector brings air from the sampling pipeline with sampling holes at specific locations (replacing the detectors). Most of the intake air is returned back into the environment, and only a small volume is supplied through 10 micron filter into the measuring chamber. This ensures a very long filter life cycle and enables the detector to monitor its status and report when it needs to be replaced.

Aspirating detector operation presentation:

Click on the image to activate the controls, right-click and select zoom to enlarge the image.

There are different versions available which differ from each other primarily by fan performance and consequently by the maximum possible length of the sampling pipeline.
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Fire gas detectors detect characteristic gases (CO, H2, KW / NOx) that develop in the early stages of a fire. A single detector includes multiple highly sensitive gas sensors. The detector processes the signals coming from the sensors and sends them to the fire alarm central control panel via the alarm and error relay or M-bus communication channel.
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Flame detectors detect flame radiation in different spectral areas: from ultraviolet to diverse IR radiation, some use only one spectrum in the process of flame detection, whereas others use many different spectra. Detectors compare different characteristics of the detected radiation, from the flickering to the radiation intensity ratio in different spectral areas, which enables the flame detection process to be very reliable and fast. Flame detectors are the so-called “spatial” detectors (similar to the system of detecting on the basis of a video image) as they control the entire space in contrast to pin-point smoke detectors that trigger an alarm when smoke enters in their measuring chamber. The visibility between the location of the fire and the detector needs to be uninterrupted. There exists an entire family of flame detectors with different characteristics. The most sensitive among them can detect a fire of size 30cm x 30cm (gasoline) at a distance of 60m in 10 seconds!
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IR temperature detectors detect IR radiation as a result of overheating. The detector triggers an alarm if the temperature on the surface of the controlled object rises beyond a certain pre-set limit. This system may be used for the control of stationary objects or moving objects. These detectors are “spatial” as well, their field of view is approx. 30 degrees.
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The sensitive component of line detectors is placed along the line, as opposed to pin-point detectors where the sensor is installed within a detector in one “point”. Line detectors may be sensitive to temperature (temperature cable) or smoke (beam detector).

Beam detector is a line detector which is sensitive to smoke and also to temperature. This detector includes an IR transmitter and an IR receiver, which are usually installed on the opposite walls of the controlled area (the walls must be mechanically stable). If the beam is interrupted by smoke particles, its strength decreases, and in the case of significant impairment of the beam the detector triggers an alarm. The sensitivity of the detector can be adjusted in several stages. The detector may also trigger an alarm in the event of high temperature air waves that modulate the beam (a phenomenon similar to the Fata Morgana phenomenon over a hot surface).

Protectowire temperature (thermal) cable consists of two elastic conductors which are intertwined so as to create a force that compresses them. This is prevented by the temperature-sensitive insulation. If the temperature of the cable rises above the default temperature set in the factory, the insulation yields and a short-circuit occurs between the conductors. The detector is very reliable and does not trigger false alarms. It can replace pin-point temperature detectors and is mainly used for detection in cable channels, duplicate technical ceilings…
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Bartec Red Guard temperature cable is a special cable with a range (set in the factory or by the client) of installed pin-point temperature sensors. All sensors digitally communicate with the control electronics monitoring the temperature of each individual sensor. You can use the software settings to define the conditions for triggering an alarm: temperature increase value above the set limit or temperature increase rate. The sensors may be linked into groups with the same characteristics or considered individually. Each individual sensor can also be connected to or disconnected from the detection system. The control electronics may be connected to the addressable central control panel in different ways, but also has some of its own control outputs (up to 200).

The cable can be up to 2km long with maximum 250 sensors in total and may be used for both fire detection and temperature control in technological processes.

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